In the box.com backend there was not just one file with this error message. When I stopped the verify there were over 50 files (total 400 blocks each 15 MB)! There are only 6 Gigabyte of backup data and I stopped after 50 error files 15MB each. Valued about 20%-30% of the files were corrupt.
I had hash-erors as you can see here. Is this an indicator?
To be sure my computers, harddrives aso. are ok I started some tests:
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As I wrote before: Memory Check on 2 computers without error
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I have Gigabytes of RAR-Files which my server produces every night (the computer duplicati is running). The same files that go into the cloud with duplicati go also to an external drive with RAR rotating in 4 week-folders. The last hours I tested about 80 Gigabytes without a CRC-Failure.
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I also have direct 1:1 copies from one computer to another. I compared all files that have changed the last 21 days. Also compared many, many Gigabytes. No binary difference.
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If one of my harddrives would have a defect there won’t be a problem with backup to USB-Drive AND backup to box.com AND backup to dropbox.com.
So I have
- no problem with robocopy direct 1:1 copies over local network, the files are binary identical
- no problem with rar copies over local network, the rars are CRC valid
So it is a little bit strange that the only problem I have with data corrupting is with duplicati backups. But I must say: Duplicati is the only application I use that uses cloud-providers!
At the moment I donwload a mega nz Backup with about 10GB. I will verify that in the evening where the download is ready.